23... e8e6  24. b5a5 Here Black's position is already difficult, as White has a clear plan to improve the position, which could be to bring the other rook to b5 or to advance the a-pawn. Although it's still possible to fight for equality with computer moves, the task is quite difficult during the game. 24... d8d7  25. b1b5  25... c7d8 Black doesn't have a clear plan, he can only try to hold on and wait to see White's intentions.